body {
    background-color: #222222;
    min-height: 100vh;
  }
  
  .app {
    padding-top: 10rem;
  }
  
  .header {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 50px;
    color: yellowgreen;
  }
  
  .logo {
    animation: App-logo-spin infinite 20s linear;
    height: 2vmin;
    pointer-events: none;
  }
  
  .todo-list {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
  }
  
  .todo {
    display: flex;
    align-items: center;
    margin: 1rem 0;
  }
  
  .todo-is-completed .checkbox {
    color: #000;
    background: #fff;
  }
  
  .todo-is-completed input {
    text-decoration: line-through;
  }
  
  .checkbox {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    margin-right: 10px;
    cursor: pointer;
    font-size: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color .2s ease-in-out;
    border: 1px solid #fff;
  }
  
  .checkbox:hover {
    background: rgba(255, 255, 255, 0.25);
    border: 1px solid rgba(255, 255, 255, 0);
  }
  
  .checkbox-checked {
    color: #000;
    background: #fff;
  }
  
  ul {
    list-style: none;
    padding: 0;
    line-height: 2rem;
  }
  
  input {
    border: none;
    background: transparent;
    color: white;
    font-size: 1.4rem;
    outline: none;
    width: 100%;
  }